Tripping mechanism



Feb. 19, 1946. J. MoFzKosKlr TRIPPING MEGHANISM Filed May 15, 1944 MWA AWO@

Patented Feb. 19, 1946 TRIPPING MECHANISM James Morkoski, Canton, Ill., assigner to International Harvester Company, a corporation of New Jersey Application May 15, 1944, Serial No. 535,651

7 Claims.

This .invention lrelates to agricultural implements and more :particularlyto a tripping mechanism for earth-working 'tools "such as cultivators.

Cultivator shovels are customarily mounted on 4Shanks which are pivoted `to a supporting standard or the like, the parts being normally so connected as to prevent the shovel or cutting blade 'from yielding under the `ordinary stressesincurred in soil penetration, but to permit yielding when such an obstruction is encountered as would damage .the `cutting .blade or its associated parts. vSpring trips to permit a cultivator shovel or the like to'yield. upon encountering an abnormal obstruction are well known. 'Such yspring trips `usually take the form of a toggle connecting the standard and the tool-carrying shank and a spring tending to straighten the toggle to hold the tool in operating position. However, a serious disadvantage inherent in `such devices is that when the joints-of the toggle are subjected to rust and wear, they act differently and the tools trip too easilyor toofdinicultly.

It is-also known to provide pins which hold the working tool in operating position but `which 'break when a predetermined stress iseencountered.

The principal objection to this type of' tripping f mechanism has been that frequent replacement of the broken pin was required, `and the device was generallyunsatisfactory.

"The principal object of the present invention Ais to provide `a simple andecient tripping mechanism for the earth-working Atool of an agricultural implement, such as a cultivator or the like.

Another object is to provide a novel mounting Vfor an earth-working tool.

` A further object is t providea novel tripping mechanism for an earth-working tool wherein a shear strip is utilized to prevent yielding of the tool and movement thereof to inoperative position under normal operating conditions, but shearable under predetermined overload to permit the tool to-yield. i

Still another object is to provide a magazineed shear strip for a cultivator :shovel by which, when a portion of the strip has .been sheared, -the unsheared part of the strip is automatically placed .in position for another shearing operation.

Other objects and advantages ofthe invention will become clear from the following detailed description when `read in conjunction with the accompanying drawing, wherein:

.Figure ,1 isa view vin fside elevation, partly in section, of :an implement embodying the features of the present invention and showing the cultivator shovel in operating position;

Figure 2 is a View similar to Figure l but showing the shovel retracted to inoperative position;

Figure 3 is a View taken on the line 3--3 of Figure 1; and

Figure i is a detail en the line i of Figure 1. In the drawing, the numeral it designates a standard adapted to be attached in a manner well-known in the art to an implement frame. However, for convenience, only that .portion of the implement illustrative of the present invention is shown in the drawing. Standard Il] is broadened at its base and bifuroated at its lower end to provide laterally spaced ears H having openings therein for the pivotal mounting of a tool-carrying shank generally indicated at l2. Shank l2 comprises a body portion I3 having pivoted thereto, by a pin i4, a tool-carrying member l5. Portions i3 and i5 are held adjustably Vagainst relative pivotal movement by a bolt IB extending through a boss Il depending from portion i3 of the shank and having a threaded end received in a correspondingly threaded swivel I8 -pivoted on the tool-carrying portion l5. Bolt I6 is held against axial movement in boss Il by a collar IS.

The lower portion of standard l@ between ears i l ris arcuately shaped to form a socket En. Body portion I3 of shank l2 is pivoted upon a pin 2| between the ears Il and has its upper surface complementarily shaped to mate with the socket `portion V2li of standard Il) to forni a joint therewith. Thus shank i 2 has pivotal movement with respect to standard ill, andthe upper surface thereof is in sliding engagement with the socket portion 2l).

` The mechanism Vby which shank l2 is held against movement te inoperative position includes a shear strip 22, Ipreferably consisting `of an elongated strip of metal of rectangular crosssection, as clearly shown in Figure 3, and capable of withstanding a predetermined shear stress.

`Strip 22 is slidably received in an opening 23 in the standard i extending in a generally axial direction therethrough and opening into the socket 2d. It will be noted particularly well in Figure 1 'that the' upperrsurface of body portion i3 of shank 52 has an offset portion forming with the socket 2t a groove or recess 24 `extending at least the width of the strip 22 and occupying a considerable portion of the arcuate upper portion of the shank: Thus, the recess or groove 24 extends to the outside of the implement to provide amarginal opening between the lower portion of standard III and the shank l2. The shoulder 25 formed by the offset portion of body I3 is in alinement with the opening 23 when the tool is in operating position, as indicated in Figure 1. In

this position, therefore, the strip 22 extends into a clip 29 fastened thereto by a bolt '30. Clip 23 is adapted to lit over the top of strip 22, and the tension upon the spring 2'I thus urges it into the recess or oiset 24, so that each time a section is sheared from the strip 22, and shank I2 is returned to its operating position, a successive portion of the strip is automatically forced into position against the shoulder 25 in readiness for another stripping operation Shank I2 after pivoting rearwardly to the position shown in Figure 2 is urged back to operative position by a spring 3| having a transversely bent upper end 32 pivotally received in the bushing 28 in standard III and its lower end bent to form a transverse portion 33 pivoted in the body portion I3 of shank I2. Transverse portion 33 extends a suicient distance laterally from the body portion I3 to contact an offset portion 34 of standard I to serve as a stop and limit the rearward pivoting of the shank.

vThe marginal opening to recess 24 is closed by a leaf spring 35 fastened at its upper end to standard I 0 by a screw 35. The lower end of spring 35, closing Vthe/opening to recess 24, is deflected outwardly by the sheared portion 38 of the strip 22 and the shoulder 25 of the shank. The sheared portion 38 is frequently held in place against the shoulder 25 by friction and does not Y become unseated when the'tool-carrying shank is pivoted. However, upon return of the shank to operating position, the sheared portion '38 is engaged by the spring 35 and is unseated thereby. The spring 35 thus serves the double function of protecting the recess 24 against the entrance of foreign material and electing the sheared portions of the strip 22.

As'pointed out before, the tool-carrying portion I ofV shank I2 is adjustable with respect tothe body portion I3 by means of the boltA I6 in order to vary the pitch of the cutting blade 26 and the angle at whichv it penetrates the soil.

It should now be clear that a simple and eilicient magazine type of feed for the trip mechanism of an agricultural implement has been provided. Ifdesired, in order to protect the mechanism against the entrance of dirt and other foreign matter, a guard 39 may be provided.

While the invention has been described in its application to a cultivator shovel supported upon a standard, it should be understood that the invention is likewise Vapplicable tov other earthworking tools, Therefore, it is desired that the invention be limited only by the scope of the appended claims. Y

What is claimed is:

1, In an agricultural implement, a standard having a socket, a tool-carrying shank having a mating portion forming a joint with said socket, means pivoting said shank to said standardfor movement to and from operating position, resili- 2. In an agricultural implement, a'standard.

having a socket, a tool-carrying shank having a mating portion forming a joint with said socket, means pivoting said shank to said standard for movement to and from operating position, resilient means urging said shankto working position, the mating portion of said shank having an offset portion and a shoulder and deningwith said socket a recess opening to the outside, means for preventing movement of said shank to inoperative position comprising ya' magazine-,fed shear strip extending into said recessV and engaging said shoulder, resilient means biasing said shear strip into said recess, and yieldable means closing the opening to said recess.

3. In an agriculturalimplement, the combination of a supporting standard having an arcuate socket, a complementary tool-carrying shank having an offset portion spaced from the wall of said socket and a shoulder portion adjacent thereto, Y

said offset portion forming a marginal opening in said shank, means pivoting said shank on vsaid standard for movement to inoperativerposition in response to overload thereon,.rneans for preventing movement of said tool-carrying shank to inoperative position including an openingV in Vsaid standard in alinement with said shoulder-When th'e tool-carrying shank is in operating position, la

shear member slidable in said opening and operatively engaging said shoulder, said member being adapted to shear under a predetermined load on said tool-carrying shank, and a resilient member carried by said standard for urging said strip into operative engagement with said shoulder.

4. In'an agricultural implement, the combina'- tion of a supporting-standard having an arcuate socket, a complementary tool-carryingV shank forming` a joint with said socket and having anY serving to eject the sheared portion of said shear strip. c

5. In an agricultural implement, the combination of a supporting standard having an arcuate socket, a complementary tool-carrying shank forming a joint with' said socket and having 'an offset portion with an abutment at its inner end, means pivoting said shank to said standard for movement to inoperative position, a shear lstrip carried by said standard extendingV into' said groove and operatively engaging said abutment to prevent movement of said shank to inopera-Y tive position, means carried by said standard for urging successive portions of said strip intosaid groove, said groove forming a marginal opening between said standardV and said shankfor Vthe discharge of the sheared portion of said strip when the shank has pivoted to inoperative position, and a leaf spring secured at one end to said standard, th'e free end of said spring covering said opening and serving to eject the sheared portion of said shear strip.

6. In an agricultural implement, the combination of a supporting standard having an arcuate socket, a complementary tool-carrying shank forming a joint with said socket and having an offset portion with an abutment at its inner end, means pivoting said shank to said standard for movement to inoperative position, a shear strip carried by said standard extending into said groove and operatively engaging said abutment to prevent movement of said shank to inoperative position, means carried by said standard for urging successive portions of said strip into said groove, said groove forming a marginal opening between said standard and said shank for th'e discharge of the sheared portion of said strip when the shank has pivoted to inoperative position, a yieldable member covering said opening and serving to eject the sheared portion of said shear strip, and spring means connecting said standard and said shank arranged to bias said tool-carrying shank to operative position.

7. In an agricultural imp1ementth'e combination of a supporting standard having laterally spaced ears at its lower end and an arcuate socket therebetween, a tool-carrying shank pivoted between said ears for movement to and from working position and having a mating portion at its upper end adapted to form a joint with said socket, means pivoting said shank to said standard, means holding said shank in operative position, said shank comprising a body portion and a blade-carryingr portion pivoted to said body portion, adjustable means for holding said bladecarrying portion against movement with :respect to said body portion, means pivoting said, Shank to said standard, means holding said sh'ank in operating position including a shearable strip slidingly carried by said standard and extending into said arcuate socket, said mating portion and said socket defining a recess arranged to receive the end of said strip, and means carried by said standard for urging said strip into said recess.

JAMES MORKOSKI. 

